Glass-working apparatus.



BEST AVAILABLE COP MM by .h w a 9 a. w m. W Q v H M. O 8 N e M m m E S.A U... H P w R 1 A 1. J N 01 w A. @m G m l K 4 .W n .3 L Wm H m A v e EM 9 H 5 7 EM 7 w O 2 w, 8 0U o. 2 N y.

BEST AVNLABLE C Na. 205,054. PATBNTED NOV. 21, 19215.

W. GOLBURN.

GLASS WORKING APPARATUS.

APPLIOATIOH FILED 00T.1,1903.

6 SHEETS-SHEET 2.

BEST AVAILABLE COP PAT I. W. GOLBURN.

GLASS WORKING APPARATUS. APYLIOATI-OH FILED 00121, 1903.

ENTBD NOV. 21, 1905.

6 SHEBTSSHEET 3.

' INVENTEJF? CLQAWW BEST AVAILABLE COP" No. 805,054. PATENTBDN,OV.21;1905.

I 1. W OOLBUBN. GLASS WORKING APPARATUS.

APYLIGA'IIOE FILED OGT.1, 1903.

E SHEETS-SHEET 4.

I ITNESEE M f a BEST AVMLAB CO? PUATENTEDZ-N'OV. 3;, 1905.

pic. 805,054.

- I. W. 'c LBi'mN, GLASS WORKING APPARATUS.

Anmouron rum) 00 .1, 1903. I

' e'snnms-snnm's.

WITNESSE I INVENTEIF' BEST AVAILABLE COP I No .-';805,054',

I. W. OOLBURN.

GLASS WORKING APPARATUS; I ai'PLmATmN 211.21) 00121, 1903.

' 6 SHBBTS'fBHEET 6.

wmm.

PATENTEDNOV. 21, 1905.

' ciaims appended hereto.

BEST AVAILABLEC'OP: P l i PATEEIOFFIGE.

UNITED sia'rn's IRVING w. COLBURN, or FRANKLIN, ENNSYL ANIA.

GLASS-weakens. APeAnATus.--

' Ton/ll whom, it may con-corn.-

' Be it known that I, IRVING W. GOLBURN, of

-. Franklin, Pennsylvania, have invented a new and useful Improvement inGlass \Vorking Apparatus, which invention is fully set forth in thefollowing specification.

This invention relates ,to the art of glass working, and moreparticularly to the art of drawing glass cylinders designed either foruse I in cylindrical form or to be split and flattened out to formsheets of glass in ways well known in the art.

In my application, Serial No. 173,865, filed September 19, 1903, I haveshown an a'pparatus for drawing cylinders of. glass, which .apparatus isprovided with means for main- Itaining the bathof molten glass in thereceiving chamberor pot at a constant level as the cylinder is beingdrawn, which level may be,

i'and preferably is, at the point where the glass would overflow fromthe pot, and in said application I have shown as a specific means for.imaintaining said constant level in the rc'ceiving chamber or pot a.displacement member {controlled by the operator of the machine.

' My present invention while of the same general design as thatdescribed in the application above. referred to differs. from' the samein many important particulars. For example,

- the constant level or overflow of glass in a trough, chamber, or potis maintained hycornpressed air acting to force thebath of molten glassinto said pot, and the various exterior and interior cooling devices forthe cylinder, the form of the bait for receiving the upper end of thecylinder, and the means for e'Ierating the bait and for feeding thesupply of compressed air' within the cylinder and circu' latingmediumthrough the cooling device in I said cylinder difi'er from theconstruction disdigs-ed in my former application. W hile the mejsentinvention is more specific than that Mtdrth in my application referredto, nevertheless the inventive idea contained in the present inventionis capable of receiving'a variety of mechanical expressions, someofgwhieh are illustrated in the accompanying drawings,

forming part of this application, and others .which will .beincludedwithin the scope of the Referring to the drawings, Figure 1 is a gitrty-s ectional and partly-elevational view of e apparatus. Fig. 2 is asectional detail showing the molten glass normally occupying the samelevel in the melting, the deliver-y and the-receiving chambers. Fig. 3is an ele- Specification of Letters Iat ent. v

Application filed October 1. 1903. Serial No. 175.375. 7

cation with the external atmosphere.

Patented Nov; 21, 1905.

vational' view of theapparatus from the lefthand side of Fig. 1. .Fig; 4is a verticalcrosssection, and Fig. 5 a horizontal cross-section, of theinterior cooling-ring of the apparatus. Fig. 6 is a vertical sectionalview of the'compressed-air conduit leading to the'interior of thecylinder, together with ayalve device foij controlling the air-pressurepassingzthere-f through. Figs. 7 and 8 are enlarged views};

in vertical section, showing some of the in elevation, Fig. 7 showingthe delivery-5 chamber free from air-pressure andthe melti ing glass inthe delivery and receiving ,eha'm;

bers on a common level, while Fig. 8 shows .the levels of the moltenglas's in the twochamg hers when compressed l air is admitted" to thedelivery-chamber and the'glass is forced to the.

overflow position in the receiving-pot during the act of drawing 1acylinder. Fig. T9 is is;

transverse section onthe litre 9.9, Fig. 1,'s ho w-E g the parts belowsaid line in' plan; Fig- 10 is a view showing a modification-of'the mp5;per margin of the delivery'chamberor pot Fig. 11 is'a vertical section,showing parts in? side-elevation, of'the'delivery chamberor pot and theparts immediately associated, there? with'and acover in place over said.pot for; preventing the radiation of heat therefromai Fig. 12 is avertical, detailed section of a rno'di-I- 6, said pot being heated bymeansof the heat." ing-chamber ism-rounding said pot, which L chamber isin free communication with flue 8, leading to the stacker any othercommuni- Within the pot is a filling-block 9,.whicl i may be of anysuitable form or constructionci.

'here ShQY-u as in the nature of-a hollow stem j tapering from the topdownward. The func-F tion of this filling-block is tof-materiallydb'minish the amount of glass-{required to filt the receiving chamber or,potjto overflowing" and also to largely diminishthe area of the 'uppersurface of the molten glass within the pot, and thereby correspondinglydiminish' the radiation of heat from said upper surface; Thiscontributes both to the maintenanceof- I the glass in proper conditionforwork-ingj fifl havi-ng a-stopmck -31, by-whmhtherflow or air maylie-turned onor off, as desired. In

BEST AVAILABLE COP and also prevents the radiagipn of heat, which wouldinjuriously interfere withthe proper manipulation of the cylinder ofglass as the same is being drawn. The heating-chamber 7 may be heated inany-suitable manner-as, forexarnplc, by a series of gas-jetalon'e ofwhich, 10, is shown in Figs. 1 and 7. For the purpose of supplyingair-pressu re to the delivery-chamber 2 a pipe 11(see'Figs, l and9)'opens into said chamber, said pipe being a controlled by a valve 12in a suitablepositiou to be manipulated by the operator as thecylinderis being drawn.

Referring-to Fig. 1,13 and 14 are crossheads'havingvertioal movement onupright ways 15 15, The lower one of these crossheads 13acts to supportthe bait 16, which is secured to a'bai't-plate 17in any suitablemannor-seas to form an -air-tight joint. One

convenient means is by the use of suitable clamps 18 (see Fig. 3)fulcrumed on the baitplateand 'having armsconnected by links 20; 20 to avertically-moving collar 19, normally held in an elevated position by aspring 22,

reacting between said collar and the bait-plate 17 'When this collar 19is depressed, it acts toforce the upper arms of the clamps 18 outward,and thereby the lower or clamping jaws of the clamps are forced inward,so as to effectively secure the-bait to the-clamping-plate j 17. Thesleeve- 19 may be caused to move downward against the-extension of thespring 22 bymeanspf a cam-ring 21, located between the sleeve 19 and thecross-head 13, as will be readily understood .from an inspection ofFigs. 1, 7, and 8. The sleeve 19 and the "ring 21 surround a sleeve 24,rigidly secured to the bait'plate-17 and to the-"cross-head- 13, so thatthe cross-head 13, the-bait, bait-plate, and clamping'apparatus all movetogether. The bait-plate 17 is provided with means for Iadmitting-compressed air withinthe-cyiinders as the same is .beingdrawn, the means t harassing t u r heapn snip 304a certain portionof-(the same' W'llif'bfi vented, through the vent-27, and.- theam'ountsureipassing throughth'e-pipe 25120 the cylinhere shown-being a pipe 25,having a flexible section'26, which connects with-a supply-pipeadditiouto the stop-cock 31 there is provided a -valv =.'=28,-controlling a vent from the pipe'30 to the atmosphere.- The constructionof 'this valve will best be understood from an inspection of Figs. 1 and6.- The valve isin the form of'a sleeve 28, having a handle 29, by whichthe sleeve may he slid up'and down overthe yen V27, as will bereadilyunderstoody the-- limit of movement of. the: sleevebeiBgI-dBiBf-fi;

mined by shoulders 62 above and beiow-rthe= said vent. Assuming air at agiye'na-pressane der being drawn A will? {be deterniinedlby' the amountof pressure permitted "to escape mpu n the vent 8'1,- and thisihfturnwill be drawn and compressedgair is thereto througflrpipea} 5if}? For the purpose of raising andxioweringereesdieadkl tmarrying;

.2 eoaosg,

elevating the bait cross-head 13,, and, as here 7 shown, said meansconsist of ropes or cables 32, attach edto the cross-head and passingover drum 33; borne on the shaft 34; turning in bearings 35 upon theupper. portien of the guideways 15, which shaft maybe operated from anysuitable source of power -as, for ex- 37 by bevel-gears 3839, whichshaft 31 is in turn geared to the shaft 34 by bevel-gears'40 l and 41,all as clearly shown in Fig. 1.

In order that the best results may besecured and that glass of properthickness may be drawn, ithas been found necessary to provide coolingapparatus on both the exterior and the interior of the cylinder adjacentto the level of the molten glass where it is drawn from thereceiving-chamber 5. v The exterior ploy is best shown in Figs. 1, 7, 8,and 11, wherein 42 represents a coil of pipe for conducting thecoolingfluid or medium, which cooling apparatus which it is preferred tosm-V coil is supported in sliding frames 43, which i are capable ofvertical-movement on the ways 15 in order that'the-cooling apparatus maybe elevated when it is found desirable to cover This coil of pipe issupthe receiving chamber or pot with a'cover 44, as shown in Fig. 11. pliedwith inlet-pipe 45 and outlet-pipe 46. (Shown in Fig. 3.) In addition tothe cooling-coil 42 the frames 43 also support a ring or annulargas-conduit 64, which-is providedwith inwardly-projecting'jets 65, Fig.1,- and connected to ages-main 66 by a flexible pipe 67 and branch pipe68, all asclearly shown in in Fig. The interior cooling' device consistsof a IIO cooling ring or chamber 47, Figs. 1, 4, and 5 ff supported onthe end of a tube 48, depending 1 from the cross-head 14 and passingthrough V the cross-head 13 and provided with astuifingbox 49. This tube48 is concentric with the. sleevo24, which is supportd=by tl16-0lOSS-..

head "13.and;in turn-supportsthebait-plate 17. The-stuifiug box- :49:prevents the escape of cpmpressedzaireatthejointbetweensaidsleeve 24a(1" 'hetube'48when;thecylinder is being admitted ith ,it'theccoling-rinzifi chhleaor ropes 50 aire attach'eli'ithereto -over-'drum 51, supported'on' s gait 52, having bearings 53 upon the upperportion of the ways' 15'15. saidshait being operated to win he ca '71:.-50 on the crates Shafthfi through bevel-gears 56 5? at 80 ample, bycrank36, geared to vertical shaft. I

BEST AVAILABLE COP- one end of said shaft and 58 and 59at the other endthereof.

The cooling-ring &7 in the present instance is shown in the form of anannular casting; but it might be simply a coil ofpipe or any otherannular conduit supplied with a cooling- .medium'by-mcans of a conduit60, the fluid} :finding exit byway of pipe 61, both of which pipes passdownward through the cross-head 14jand withinthe tube 48, supporting thecooling ring-di, as will clearly appear from an inspectionof Figs. 1 and7.

- Preferably the receiving chamber or :pot

. is narrowedin at the top, so that when the filling-block Sl is inplace there is a very small surface ofthemoltenglass insaid receivingchamber or pot' expo'sed,thereby greatly reducing the ameunt ofradiation of heat, and

' with anu'pward and outward flare 695terminating in an. annulardepression on. trough '70,.

j v the chamber or pot 'isprovided with an over- -fiow ge or lip,preferably constructed in the manner shown in Figs. 7 and 8 that is tosay,

vwhich entirelysurrou ads the overflow-lip and words a seat forthe-lower portion ofthe-be'rt- ;I6; tl 1is being particularlyadvantageouswhew the lower lip or iharginofth bait is of theparticulariform shown in Figs. 7 and 8.

7 It has '"b'f'n foiindin' practice that the'glas's will pull ofi.offthe overflow-lip much more I g readily if the'lip i's hotter than theglass which isj t-flown over- ;it; and means are therefore i-dyided'forhe'ating the said lip to a point somewhat'above-tbat outs bodyprmass of;

the glas s in-gthe receiving chambr or pot. This is accomplished bydividing the heating chamber around said rece1ving chamber or .potintofipper'and lower compartments, the

upper comparment 71 of'w-hich has its upper wall formed partly by theoverflowlip,-and the temperature of the two compartments 71 and 7 of theheatingchamber can. be regulated bycontrolling the supply of fuelthrough i the jets 10, .which lead into the chamber 7,

andjets 72, which lead into the upper chamber 71, or any other suitablemeans may be employed for supplying the necessary amount of heatto thetwo chambers. By thus keep ing the upper chambcril hotter than thelowenchamber 7 the glass which, is being forced from the lower portionof the receiving-chamber or potto the upper portion there of isslightly-cooler than the surface of the overflow lip andthe glass willtherefore deliver to the cylinder being drawn with less resistance-dietis, it will pull ofl'- of the lip easierhnd decrease the possibilityofdrawing the glasstoo thin.

While the flaring overflowlip of the form shown iii-Figs and S'isthe onepreferred, 'in someinstances it may be found desirable to use/anoverflow-lip having a substantially horizontal surface of the charactershown in 12, and while the bait may be,'and preferablyisgiarge enough tosu round the overflowoperation in the groove 70, as shown in Fig 7, thisis notateH-necessary, since the bait may be ing chamber or pot, ifdesired or of any other desired diameter less than that; of the exteriorI tion is ill us'trated in 1 9,wheie in the bait 16'.

1 by claiiiiiing-hohks 18", havin' upwardly-- .a plate 74, mounted is ofmuch less dia eterTthanthatof the coolplate 7; may be rev lved bythe-operator theapparatus. a r

any convenient form which will permit the ofgreater diameterthan thatofthe interior.

her or pot; For exam'ple', the overflow edge overflow lip-or margin ofthis character as readily as with the other forms shown;

chamber 2 byvalve 12. the molten. glass 'in and the receiving-chamberwill all be at the chamber 2 to permit the glass in the meltingconduit 6the receiving chamb'ev or pot. The'glass in s'a'id receiving"cliamberor-pot having been brought tothe desired temperature, the coolingwoil 42and the gascoilffia Fig. .1, andthe cooling medium being turned gas atthe jets: Gtiiighted, but turned iow, so

'of small diameter is clampe'd to the bait-plate ports the cooling-r1 g47; which'in'this' case" liptand take seat at the commencement of thesmall enough to enter the mouth of'the receivdiameter ofthei)ve;flow-.lip. Such a construci i projecting arms enterjng eccentr 0slots 73 in i {in a; sleeve or bushing 75 and surroundinifhe tube48;;which' supv 4. a as the receivmg chamber or pot should he in a 1 theform of a distinct li-pyas (it may assume glass to flowi upward, so asto give a' suntace, 1- i ing-ring47'.;(Shown thiotherfiguresJlThediamete' r of the'mouth of the receiving chem 1 i f -i V ,otthcreceiving chamber or'pot may be in the'form of anannular ledge-I77,1'0}; which ledge'is caused by slightly depressing irog the surfaceofthe tableimrnediately surround-" ing the mouth of the receiving chamberor pot, and it will be readily understood that the bait-may be broughtinto operation with an b Operation: Assuming the machine to be at restwiththe parts as shown in Fig. 7 and compressed air shut off from thepressure-" the "melting-chamber, the pressure-chamber,

same level, as is clearly shown inFig. 2, the i valve t opening'imnardfrom the delivery ,1 2o,- chamber fltoenter said delivery chamberthroughthe conduit 3 and thence through the being in the lowermostposition, asshown'in on, so as frocirculate th rough the coil 42, the lthe chamber 2, the amount of pressure being prcssu re in thepressure-chamber 2 is released, yhereby permitting the glass in thereceiving {:chamber or p'ot to drop back to the levi of the glass in thedelivery-chamber and leaving BEST AVAILABLE COP V as to deliver butlittle heat, the lower or bait cross-head 13 being in position, so as topermit the bait 16 to surround the oyerllow-lip of the receiving chamberoxypoa as-shn'wn in Fig. 7, and the inside tonngeas fbujng in its lowestposition, as 'shown 1315i and 7, with cooling medium circulating there-fthrough and the air-supply bellig-Clliflffffiflfii the pressure-pipe2.3, tlie 'hait-=1l.6-, i$"firmly clamped to the bait-plate l7, so as toform'an airtight joint therewith, and the apparatus is theniii-readiness to. commence to draw the cylinder. The molten glass in thereceivingchamber is now forced over, the top of the overflow-lip byadmittingcompressed ".ir in regulated by the valve 1 2. The pressure ofthe air within said chamber will act to close the return-valve 4,controllingthe conduit 3, leading from the meltingor refining chamber,and the glass will be forced through conduit 6 u pward in the receivingfc'h am beror pot and from the overflow-lip (5}), where it is caught bythe bait 16, whereupgin the bait is started on its ups ward travel ijivturning the crank 36. Simultaneously with the upward movement of thebait compfessed air is admitted into the cylinder at desired pressurethrough pipe 25,

the pressure being regulated by the slidesleeve 28, so as tokeep thecylinder expanded to thc;=,dcsired diameter. The overflow of moltenglass at the overflow-lip may be in- ;ycreased. decreased, or maintainedconstant at the giwill of-theoperator by controlling the amount ofpressure passing to the pressurechdmber 2, this pressure being,controlled by the regulating valvc 12. hen the cylinder been drawn tothe desired length, the

the cylinder with no more glass to pull from. The bait, continuingits'upward movement with its speed accelerated, if desired, andthepressure in the cylinder maintained and, if

' necessary or desirable, increased in amount,

the cylinder will thusbe severed from the glass in the receiving chamberor pot. In

many cases'it may be found desirable toincrease the heat around the baseof the cylinder by increasing the flame from the jet 65,

so as to melt the lower part of the cylinder, and this, with-the upwardmovement of the cross-head 13 accelerated, if desired and the pressureon the interior of the cylinder will result in athin film of soft.melted-glass at the base of the cylinder, which is subjected to in--ternal pressure, thereby causing the soft glass toblowout and detachingthe cylinder-from j the qyerliow-llp. After the cylinder has thusbeen'severed at the lower end the valve 31 clos d, thus shutting Iofi'the pressureof air passing into the cylinder th rough pipe 25, and

" 5 thecrosshead 13 is raisedhigh enoughjso' that.

the bottom of the cylinder will clear the cooling-coil $2. The insidecooling-ring 47 isalso raised to its highest position by means of; th iAnysuit- ,7G

crank 54 operating on drum 51. able clamp or supporting device being nowapplied to the bait 16, the clamps iwhichllold it to the bait-plate 17are released,' and the cyiinder is carried oil by means-0f tongs oressary to heat-the glass inthe receiving-chain i her to get it intoproper condition for subser. quent working, and this is accomplished byraising the frames 43 43, which carrythecooling-coil 42 and the gas-coil64, and placing the cover 44 over thetop of the receiving chamher, asshown in Fig. 11, thereby preventing the heat from passing out of; thetop of h receiving-chamber. 1

. It will be understood thatith e fi l ling; "f

9 may be open at the top, as shown in -most. of the figures, or in Fig.10.

What is claimed is l 1. In a glass-drawing apparatus, the comhination ofglass-drawing devices, a melting or refining chamber, a receivingchaniber'o'r poli ic; a delivery-chamber, intermediate/the refining rand receiving chambers,means supplying on}, r f

pressedair to the upper partof thedli ryrchamber, and a valvecontrolling the flow of molten glass from delivery-chamber.

2. Inaglass-drawing app ratus,the-combi-Q nation of-glass-drawingdevicea a melti ng'or refining chamber, a receiving'jchamberpr'pot adelivery-chamber intermediate the refining, and receiving chamhers,meanssupplying compressed airto the upper part of the delivery-4 i chamber,and a valve automatically controlling the flow of molten glass fromchamber to the delivery-chamber. Y 1

3. In a glass-d rawing apparatus, the combination of glass-drawingdevices, a melting or refining chamber, a receiving chamber. or pot, adeliverychamber intermediate the refining .and receiving chambers, meansacting under icall y close communication between saidlchamher and themelting-chamber. andmeans supplying compressed air to the delivery-cham4. In a glass-dra'wingl, apparatus, the combi'-. nation of glass-drawingdevices, a meltingorrefining chamber, 'a'receiving chamber'o'rpot, a,delivery-chamber .inte'rmed late .the. regming and, receiving; chambers,means acting under the operation of drawing anothercylinde'r is themelting-chamber iS the melting-- 1 y 1 20 prcssu re in' thedelivery-chamber to auto'mat l B EST AVAl-LABLE COP pressure in thedelivery-chamber to automat ically close communication between saidchamher and. the melting chamber, means supplying compressed air tothe-dehiery-chamber, and a device for regulating the tension of thecompressed-air supply.

5. In aglass-drawing apparatus, the corn bination-of a chamber or potfor molten glass and having std-overflow margin or iip, with 'means'forheating the chamber or potwithits contained charge of glass, andvindependent means forheating said overflow margin 01'' lip wherebythemargin or lip'niay be maintained at a highertemperature than theglass.

within the pot.-

6.. In a glass-drawing appareftaa'the corn hi nation-'of'a' chamber orpot fo'n'molten glass and havingan overflow margin'or lip, a heat ingchamber or furnace snrronnding'the main body of the said pot-,and asecond heating chamber-or furnace for heating the margin or lip,'wherebythe said margin or lip may be mainta'i edatahighe'rtemperature than'thefl'glass withinsaid pot. J 5

7. In a glass-drawing apparatus, the eornbi ;-nation;. of a chamber or,pot for the moltenglass, a bait for drawing the glass therefrom; and anannular groove or trough surrounding the upper margin or lip of saidchamber.

' 3. In a glasssdrawing. apparatus; a chamberor pot or receptaclecontaining molten glass, an annular bait for drawing a cylinder of glasstherefrom, a vertically-adjustable cooling de-' vicewithin saidcylinder, and vertically-recipr ocating supports-for said bait andcooling devrce; j

' 9. a. glass-drawing apparatus, the com'bination of a pot or receptaclecontaining molten -glass, an annular bait for drawing a cylinder ofglass therefrom, a cooling device within said cylinder, avertically-moving cross-head supporting said bait,anothervertically-moving cross-head supporting said cooling device,

and guides or ways for said crossheads.

10. In a glass-drawing,apparatus, the combination of a pot or receptaclecontaining molten glass, 2. vertically-reciprocating 'eross-, head, abait-plate carried by said cross-head, a bait removably secured to saidplate, guides or ways for said cross-head, and means for moving thecross-head in said ways.

11. In a glass-drawing apparatus, the combothof saidicoolin' d bait, andmeans independently reciprocating 5 said bait and cooling-ring.

13. In a glass-drawing apparatus, the coinbinntlon of a pot orreceptacle containing molten glass, an annular bait for drawingacylrocating in ways above said pot, a cooling dev'ice within'sa'idcylinder, a tubular support for said cooling device carried by saidcrossh'ead, and. inlet vand outlet conduits located.

from said cooling device.

14.11:; a glass'drawing. apparatiiiitheeombination of a pot orreceptacle for-molten.

glass, an" annular. cooling device and {an sin-- nular heating'device'adiaeentto but sligbtly above the mouth of said pot'orreceptacle, and vertically-ad ustable supports f orsaid cooling}.

and heating devices";

1 a fimwd i hi n t ath i ei i I] binatlomoff'at pot. orreceptaclelforgmolteln 5 glass, an annular baitj for drawing a cylindepgof glass'therefrom, vertical guidewaysadjafl cent tosaid po't,auinteriorand anexterior. cooling device for saidcylinder, said bait andi 'adn a 9Q on said guide'wayai'y 16. In a glass-drawing apparatus,

' thecom bination of a pot 'or' receptacle for m'oltnf E glass, anannular bait fordrawing'a cylinder A V, of glass therefrom', 'verticalg'uideways' adja- L95" 'inder-ofglasstherefrom, across-head recip- 7o 1within seidtubular support and leading toand 25 cent to said "pot, aninterior and an exterior a 1 cooling-device for said cylindenau exteriorheating device,;said bait heating device and". both of saidcoolmgdevices being adjustable on said guideways.-

i 17. The improvement in glass-working which consists in preparing amass of molten glass, drawing a cylinder of glass therefrom J I whilemaintaining the level of the molten glassapproximatelyconstantbylappliedpressnre, 5 y

then removing the pressure whereby the'level of the molten glass ispermittedtodrop away from the pointat which the cylinder is' being drawnand severing the bottom ofthe cylinder 7 y by the application ofinternalpressure. no

18. The improvement in the art of glassworking which cpnsists inpreparing a mass of molten glass,drawing a cylinder of glass therefrom,maintaining the level of the molten:

glass approximatelyconstantduring the draw- 5. ing operation by theapplication of pressure, then withd rawing the pressure, therebypermitting thelevel of the glass to lower or drop. away from the base ofthe cylinder-and severof the cylinder.

19. The improvement in theart of glass- 'ing the base of the cylinder byinternal pres- 12 sure and heat externally appl-iedto the base workingwhich consists in preparing a mass I I of molten glass, drawing acylinder of glass 5 therefrom, maintaining the level of the molten glassapproximately constant during the drawing of the cylinder, thenpermitting the BEST AVAlLA BLE ooP level of the molten glass toirecedeand severing the base of the cylinder therefrom by simultaneouslyapplying internal pressure to the cylinder and heat to the externalportion 5 of thebase of said" cylinder.

20.. The improvement in the art of glassworking which consists inpreparinga mass-of molten glass, drawing a cylinder of glass therefromwhile meintaining the surface-pf 5 epnlying external heat to the base ofsaid cylinder.

, 21. Tbeimprovement in thee rt of glass-b working which consists inpreparing a miss i'of molten glass, drawing a cylinder of gla'ss 20therefrom, maintaining the" 'snrfaoe of' the molten glass approximatelyconstant during the-drawing operation by pressure applied to the irnolten glass and then s'erering' the base :eneeiiication in thejpresenof Ziie-iireivn cylinder from the base of the molten gless bywithdrawing the pressurerzs from, said molten: glass andsinrnllteneoiisly increasing the internei pres sn're within the "drawneylinder. and applying heat to the external surface of the base 'of'theevlinder.

22. In a glass-inrnaee,-- the eombinationof '3 a melting-chamber, nfluid-pressure chamber,

a iiiawing or gathering chamber, passages connecting the saidcharnhers,..o permit the new ofmolten glass from one tothe other,

and fluid-pressure (leiri'ees for driving the 35' 'glansintothedrawingor g'athering chamber,

said pressure acting directly upon the'molte'n giass'Jsuhstan'tiaiifesspecified. In testimony whereofi i beve signed this ing witnesses.

' mite iiiooLia RN. ff

Witnesses:

JNO. B; GLENN, Tnonns McGowan:

f two eubscribliq

